Project 13 XGO Meteorological Station

Ⅰ. Teaching Aims

Use fb temperature / fb humidity to obtain the real-time temperature and humidity.
Scroll or statically display values on a 5 × 7 LED dot matrix.
When the temperature/humidity exceeds the threshold, the built-in action of XGO is performed.
Understand temperature unit conversion (℃ ↔ ℉) and digital formatting.

XGO + Foxbit + MicroBlocks IDE.
XGO battery power ≥ 60 %.
MicroBlocks status bar shows a green dot, XGO-lite extension is loaded and the development board model is Foxbit.


Functions	Return to ambient temperature (℃)
Tips	DHT22 resolution is 0.1℃, DHT11 is 1℃

Functions	Return to ambient humidity (%)
Tips	DHT11 ≥ 1s sampling, DHT22 ≥ 0.5s
`() * () + ()`
Functions	Temperature unit conversion
Tips	℉ = ℃ × 1.8 + 32

Functions	Scroll to show the string to the LED dot matrix
Tips	The smaller the `pausing` is, , the faster the scrolling will be
`display text …`
Functions	Static display string
Tips	Text that is too long will be automatically truncated

Functions	Built-in body shaking action
Tips	`Shake`／`Pant`, etc., can be replaced
`XGO slide body Z by … mm`
Functions	The body slides up and down (like breathing)
Tips	Z, positive for up, negative for down

Scroll “26 °C 58 %” once per second.

Online code: Click here

Humidity > 50 % → Wave Body as a reminder

Online code: Click here

Double threshold determination: When temperature > 30℃ or humidity > 70%, XGO Shake; Otherwise, the slide body will “breathe” slightly.
Format output: Use the join to string "T:" + fb temperature + " H:" + fb humidity together and then scroll to display it.
Add a buzzer: play tone 440 Hz 500 ms when the threshold is reached to make the reminder more obvious.

Questions	Possible causes	Solutions
Temperature /humidity displays 0.0	Sampling is too fast or the sensor is disconnected	`wait ≥ 1000 ms` (DHT11); Check the P2 interface
No scrolling content on LED	Spelling mistake	Confirm that the `scroll text` parameter is a string
Actions never stop	The threshold judgment lacks “fallback”	After triggering, add `wait` or set the lock flag
There is a conflict in the sequence of actions	Both temperature and humidity exceed the threshold	Set priorities or cooldown times in the code